Signs Your Puppy Is Sick:
When to Worry, Watch & Rush
Most puppy “symptoms” are perfectly normal. A few are emergencies. Knowing which is which could save your puppy’s life. This guide tells you exactly what to do for every common symptom — organized by urgency.
🚨 Go to the Emergency Vet RIGHT NOW if You See Any of These
How to Use This Guide: The Traffic Light System
Every symptom in this guide is marked with one of three urgency levels. Use these like traffic lights.
Read the description and action for your puppy’s symptom. When in doubt, call your vet. A 2-minute phone call is always faster than an emergency visit you could have prevented.
Normal Puppy Behavior vs. Warning Signs
New puppy owners often mistake completely normal behavior for illness. Here is a clear side-by-side comparison.
✅ Normal — Not a Concern
- Sleeping 16–20 hours a day
- Startling at new sounds or sights
- Loose stool on days 1–2 after coming home (stress)
- Not eating full meals the first 1–2 days home
- Hiccupping (very common in young puppies)
- Dreaming, twitching, or paddling in sleep
- Sneezing occasionally
- Grumbling or grunting sounds while content
- Shaking after waking up (stretching the nervous system)
- Soft belly that gurgles when touched
⚠ Concerning — Act on These
- Won’t eat for more than 24 hrs (toy breeds: 12 hrs)
- Vomiting more than twice in a day
- Blood in vomit or stool — any amount
- Diarrhea lasting more than 24 hours
- Not urinating for 12+ hours
- Extreme lethargy — won’t lift head or play at all
- Persistent loud crying that nothing relieves
- Limping or refusing to put weight on a leg
- Eyes that are cloudy, discharge-filled, or red
- Belly visibly swollen or hard to the touch
Symptom-by-Symptom Reference Guide
Vomiting Once (Puppy Otherwise Acting Normal)
A single episode of vomiting in a puppy who is still playful, drinking water, and acting like themselves is usually nothing to worry about. It could be from eating too fast, an empty stomach (yellow bile in the morning), swallowing grass, or excitement. Watch for 24 hours.
✓ Monitor at home. For Maltipoos and small puppies under 12 weeks: do NOT withhold food — offer a small amount of bland food within 30–60 minutes. Hypoglycemia risk in tiny puppies outweighs the benefit of resting the stomach.Vomiting 2+ Times, or With Lethargy or No Appetite
Two or more vomiting episodes — especially combined with a puppy that seems tired, won’t eat, or is drinking a lot of water — should get a same-day vet call. This can signal parvovirus (particularly dangerous in unvaccinated puppies), dietary indiscretion, or intestinal parasites.
📞 Call your vet today. They may want to see the puppy or advise you on next steps.Vomiting Blood, or Vomiting + Bloody Diarrhea Together
Blood in vomit (looks like coffee grounds or bright red streaks) combined with any other symptom is a serious emergency. Vomiting and bloody diarrhea together is the classic presentation of Parvovirus — a fatal disease if not treated immediately. Do not wait to see if it gets better. Go now.
🚨 Emergency vet immediately. Every hour matters with Parvo.Loose Stool on Days 1–3 After Coming Home
Stress causes loose stool. Moving to a new home is the biggest stress a puppy will ever experience. Soft or loose stool in the first 2–3 days is almost always a stress response, not illness — especially if the puppy is still eating, playing, and drinking normally.
✓ Normal. Monitor. Should firm up by day 3–4 with consistent feeding.Diarrhea Lasting More Than 24 Hours or With Mucus
Diarrhea with mucus (jelly-like coating on stool) often indicates intestinal parasites like Giardia or Coccidia — both common in young puppies even from reputable breeders. These are treatable with medication from your vet. Diarrhea lasting more than 24 hours also risks dehydration, especially in small breeds.
📞 Call your vet. Bring a stool sample in a sealed bag — this speeds up diagnosis.Bloody Diarrhea (Any Amount)
Blood in the stool — whether bright red or dark and tarry — is never normal in a puppy. In combination with vomiting, it is a medical emergency consistent with Parvovirus, hemorrhagic gastroenteritis, or serious intestinal injury. Do not wait for a second episode. Go immediately.
🚨 Emergency vet. Do not wait. Bring a stool sample if you can.Sleeping a Lot or Seeming Tired After Play
Young puppies sleep 16–20 hours a day. This is not lethargy — this is normal biology. A puppy that plays hard for 15 minutes and then crashes into a deep sleep is perfectly healthy. Do not wake a sleeping puppy. Their brain and body are developing during sleep.
✓ Normal. Let them sleep. Growth happens during rest.Noticeably Less Playful or Alert Than Usual
If your puppy, who is normally bouncy and curious, seems dull, flat, or uninterested in things that usually excite them — without an obvious cause like a car ride or a big play session — this is worth noting. If it lasts more than a few hours and is combined with not eating, call your vet.
📞 Monitor for 4–6 hours. If not improving, call your vet.Cannot Stand, Move, or Lift Head
A puppy that cannot stand up, cannot lift their head, or collapses when trying to walk is in a medical emergency. This can signal severe hypoglycemia (especially in Maltipoos — rub honey on gums immediately while calling the vet), a traumatic injury, toxin ingestion, or serious systemic illness.
🚨 If small breed — rub honey on gums NOW. Then emergency vet immediately.Skipping a Meal on Day 1–2 After Coming Home
Stress suppresses appetite. Most puppies eat less than usual on the first day home, and some refuse food entirely. This is a normal stress response, not illness. Keep offering the same food at the same times. Do not add toppings or new foods to entice eating on day one.
✓ Normal. Keep offering regular meals. Monitor water intake — dehydration is more serious than a skipped meal.Not Eating for More Than 24 Hours (or 12 Hours for Maltipoos)
For most puppies: no eating for more than 24 hours warrants a call to your vet. For Maltipoos and very small Cavapoos: 12 hours without eating is the threshold. These small dogs have very little blood sugar reserve and can crash quickly into hypoglycemia.
📞 Call your vet. For Maltipoos and small breeds, act after 12 hours of no eating.Reverse Sneezing (Honking or Snorting Episodes)
Reverse sneezing is a benign spasm of the soft palate that causes a rapid, repeated honking or snorting sound — almost like the puppy is trying to inhale a sneeze. It looks alarming but is completely harmless and self-resolving, usually stopping within 30–60 seconds. Gently massaging the throat or briefly covering one nostril can help stop an episode faster. It is more common in small breeds and Teddy Bears.
✓ No action needed. If episodes become very frequent (multiple times daily), mention it at your next vet visit.Persistent Hacking Cough (Possible Kennel Cough)
Kennel cough (Bordetella) produces a harsh, dry, hacking cough — often described as if the puppy has something stuck in its throat. It is different from reverse sneezing. Kennel cough is highly contagious and spreads quickly between dogs. It is usually not life-threatening in healthy puppies, but young or unvaccinated puppies can develop complications.
📞 Call your vet within 24 hours. Isolate from other dogs in the home until confirmed.Distended Belly + Retching Without Producing Vomit
This specific combination — a visibly swollen or hard abdomen paired with a dog that is repeatedly gagging, heaving, or retching but cannot produce anything — is the classic presentation of Gastric Dilatation-Volvulus (GDV), commonly called bloat. The stomach fills with gas and twists on itself, cutting off blood supply. Without surgery within hours, it is fatal. Signs also include extreme restlessness, drooling, pale gums, and a belly that sounds hollow when tapped. Do not wait. Find the nearest emergency clinic immediately.
🚨 This is the most urgent emergency in dogs. Emergency vet immediately — minutes matter.Straining to Urinate or No Urination for 12+ Hours
Male puppies straining to urinate and producing little or nothing is a potential urinary obstruction — this can become life-threatening within hours and needs emergency care. Female puppies straining or urinating frequently in very small amounts more commonly indicates a urinary tract infection, which is serious but not immediately life-threatening — call your vet the same day. Any puppy, male or female, that has not urinated at all in 12 or more hours needs to be seen today.
🚨 Male straining with no output → emergency vet now. Female frequent small amounts → same-day call. Either sex, no urination 12+ hrs → vet today.Gum Color: Your Fastest Health Indicator
Your puppy’s gum color is one of the most reliable health indicators available to you without any equipment. Press a fingertip on the gum, release, and count how long the white spot takes to return to pink — it should return within 2 seconds (capillary refill time).
🟢 Bubblegum Pink
Healthy. Moist and pink. CRT under 2 seconds. This is what you want to see. No action needed.
🟡 Pale or White
Concerning. Can signal anemia, blood loss, shock, or low blood pressure. Call your vet or go to emergency vet now.
🔴 Blue, Gray, or Yellow
Emergency. Blue/gray = lack of oxygen. Yellow = liver involvement. Any of these colors requires an emergency vet visit immediately.
Puppy Temperature: What’s Normal and What’s Not
A rectal thermometer gives the most accurate reading. Use a digital pet thermometer — lubricate the tip, insert just 1 inch, and hold for 60 seconds. The normal range for puppies is 99.5°F to 102.5°F.
| Temperature Reading | What It Means | What to Do |
|---|---|---|
| Below 99°F / 37.2°C | Hypothermia — dangerously low | Wrap in warm blankets, call vet immediately |
| 99°F – 99.5°F | Low-normal, worth watching | Monitor closely, call vet if other symptoms present |
| 99.5°F – 102.5°F | Normal puppy temperature | No action needed |
| 102.5°F – 103°F | Mild fever — borderline | Call vet, monitor every hour |
| 103°F – 104°F | Fever — needs veterinary care today | Same-day vet visit required |
| Above 104°F / 40°C | High fever — potential emergency | Emergency vet. Do not wait. |
Breed-Specific Health Risks to Watch For
The three breeds we place at Boundless Horizon Puppies each have distinct health tendencies worth knowing. Catching the breed-specific issues early makes all the difference.
What to Tell Your Vet When You Call
A clear, organized call to your vet gets your puppy help faster. Vets triage by urgency. The more specific you are, the better they can prioritize your call. Before you dial, gather this information:
📋 The 7 Things to Have Ready When You Call
- Age and breed: “She’s a 9-week-old Cavapoo”
- Weight if you know it: Helps determine medication dosing if needed
- Vaccine status: Have health records handy — your vet will want to know if Parvo series is complete
- What you saw and exactly when it started: “Vomited twice, first at 10 AM, second at noon”
- What the vomit or stool looked like: Color, consistency, any blood or mucus
- Last time puppy ate and drank: Normal amount, less than usual, or nothing
- Any possible exposure to toxins, new foods, or foreign objects: Did they chew on anything, get into the trash, eat anything outside?
New puppy owners call me nervous, and most of the time — genuinely, most of the time — what they’re describing is normal. Puppies make weird sounds. They sleep in ways that look alarming. They throw up once from excitement. But occasionally, someone calls and I hear something in what they describe that makes me say “stop talking to me and go to the vet right now.” Learning the difference between the two is the most valuable thing you can do in your puppy’s first year.
— Dan, Owner | Boundless Horizon Puppies, Millersburg, Ohio | Est. 2022Common Health Questions From New Puppy Owners
📚 Sources & Expert References
- AVMA — Pet Poison Safety and Emergency Signs
- ASPCA Animal Poison Control Center — (888) 426-4435
- American Kennel Club — Common Puppy Health Issues
- Tilley, L.P. & Smith, F.W.K. The 5-Minute Veterinary Consult: Canine and Feline. Wiley-Blackwell, 5th Ed.
- Merck Veterinary Manual — Canine Parvoviral Enteritis, Hypoglycemia in Toy Breeds
- Boundless Horizon Puppies LLC — Licensed Ohio puppy placement, Millersburg, OH 44654 — Est. 2022